Marine toilet

ABSTRACT

A marine toilet having a bowl connected to a decontamination tank and a combination pump, macerator and valve operable to take clean water into the system, flush the water and effluent into the decontamination tank and at the end of a predetermined interval discharge the innocuous mixture of water and effluent from the tank overboard. A control circuit and flush button therein provide for initiating a flush cycle, a dispenser is connected into the circuit operable in response to initiation of a flush cycle to deposit chemical decontamination tablets into the water and effluent leaving the bowl at the time of flushing, and there are controls for preventing flushing in the event that the decontamination tank is filled and/or the dispenser is partially or completely empty.

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Traits et a1,

[451 Nov, 12, 11974 MARllNE TOHLET [75] Inventors: Wesley ill. Tufts,l-lolliston; ,lames H. Albertassi, Braintree, both of Mass.

[73] Assignee: Neutron Corporation, Braintree,

Mass.

22 Filed: Dec. 7, 1972 21 Appl. No.:313,1179

[52] US. Cl 4/95, 4/10, 4/80,

4/115, 4/D1G. 3 [51] lint. Cl E0341 5/0112, E03d 11/11 [58] Field ofSearch 4/8l0, 12,

4/69, 71, 76-78, 80, 89, 90, 93, 95, 115, DIG. 3; 210/152, 167

[56] References Cited UNITED STATES PATENTS 2,951,251 9/1960 Belden 4/10X 3,047,013 7/1962 Baumbach 4/76 X 3,563,384 2/1971 DeLaney 210/1523,579,646 5/1971 Lekberg i 4/10 3,628,196 12/1971 Quiram 210/167 X3,673,614 7/1972 Claunch 4/10 Tults c1111 4/10 X Kraemer 4/10 X PrimaryExaminer-John W. Huckcrt Assistant ExaminerStuart S. Levy Attorney,Agent, or FirmDike, Bronstcin, Roberts, Cushman & Pfund [57] ABSTRAQIT Amarine toilet having a bowl connected to a decontamination tank and acombination pump, maccrator and valve operable to take clean water intothe system, flush the water and effluent into the decontamination tankand at the end of a predetermined interval discharge the innocuousmixture of water and effluent from the tank overboard. A control circuitand flush button therein provide for initiating a flush cycle, adispenser is connected into the circuit operable in response toinitiation of a flush cycle to deposit chemical decontamination tabletsinto the water and effluent leaving the bowl at the time of flushing,and there are controls for preventing flushing in the event that thedecontamination tank is filled and/or the dispenser is partially orcompletely empty.

12 Claims, 11 Drawing Figures nonzmm I I PATENTEU S E em 6 3.846.847

FIG.5

Al LO FLUSH PATENTEU NOV 12 I974 FIGII MARINE TOILET BACKGROUND OF THEINVENTION In our pending application there is shown a marine toiletwherein there is a bowl connected to a storage tank of comparativelylarge capacity into which water and effluent from the bowl is dischargedand retained until it is rendered innocuous whereupon it is dischargedfrom the storage tank overboard.

In the aforesaid apparatus the tank is designed to hold enough of thewater and effluent so that it is possible to use the toilet a number oftimes without having to discharge the material overboard. Also, in theaforesaid toilet, the bowl and tank are embodied in a single unit whichis rather bulky and takes up a considerable amount of space and thevalve of the combination pump, macerator and valve unit is of the rotarytype and is thus prone to stick if the toilet is used only infrequently.The purpose of the improved toilet illustrated herein is to separate thetank from the bowl so as to enable using a small bowl which takes upless useful living space in the vessel and to remove the tank to an outof the way part of the vessel; further to reduce the size of the bowland the tank by using the tank. solely for the purpose ofdecontamination and not for storage; and finally to insure operationeven though the toilet may be used infrequently by improving the valve.

SUMMARY The marinetoilet according to this invention comprises a bowlopen at the top and bottom, a trap connected to the bottom opening, adecontamination tank, a combination pump, macerator and valve andconductors interconnecting the bowl and tank to intake and dischargeconductors so arranged that clean water entering the intake conductorpasses through the valve and is delivered to the bow] by the intake sideof the pump and the mixture of water and effluent is withdrawn from thetrap into the macerator and delivered to the decontamination tank by thedischarge side of the pump, said valve comprising flat valve platescontaining ports aligned by shifting of one of the flat plates relativeto the other to provide for the aforesaid introduction of clean waterinto the bowl and delivering as a mixture of water and effluent to thedecontamination tank, a solenoid-operated plunger connected to themovable one of the valve plates, said solenoid when energized beingoperable to move the movable one of the valve plates in a direction toinitiate a flushing cycle and a starting or flush buttonelectricallyconnected to the solenoid operable to energize the solenoid.A timer is operable to de-energize the solenoid at the end of apredetermined length of time whereupon the movable valve plate is movedrelative to the fixed valve plate so that clean water is supplied to thedecontamination tank and to the discharge conductor and simultaneously amixture of water and effluent is withdrawn from the decontamination tankthrough the valve into the pump and discharged thereby through thedischarge conductor. An agitator is supported in the decontaminationtank for keeping the mixture of water and effluent mixed and there is aspray head mounted in the decontamination tank and a conductor fordelivering clean water to the spray head during the discharge part ofthe cycle. A spring seated valve in the intake conductor blocks reverseflow of fluid through the system. A tablet dispenser is interposedbetween the discharge side of the trap and the macerator in the lineconducting the mixture of water and effluent from the trap to themacerator and from thence to the pump and decontamination tank by meansof which tablets are dropped into the stream of mixed water andeffluent. A flexible member is interposed between the bowl and trapembodying displaceable fingers which when undeflected extend across theopening between the bowl and trap forming a seal and antisplash guard.The combination pump, macerator and valve are mounted as a unitexteriorly of the decontamination tank so as to be accessible andremovable as a unit to permit access to the tank.

The invention will now be described in greater detail with reference tothe accompanying drawings wherein:

FIG. 1 is an elevation, partly in section, of the toilet bowl andhousing therefor;

FIG. 2 is an elevation of the decontamination tank showing thecombination pump, macerator and valve mounted to one side thereof;

FIG. 3 is a vertical section taken through the decontamination tankshowing the agitator;

FIG. 4 is a horizontal section taken through the decontamination tankshowing the combination pump, macerator and valve mounted on one sidethereof;

FIG. 5 is a fragmentary section at the bottom of the decontaminationtank showing the: connection for removing the mixed water and effluenttherefrom;

FIG. 6 is an elevation of the combination pump, macerator and valve withportions in section;

FIG. 7 is a top view looking down on FIG. 6;

FIG. 8 is a plan view of the two valve plates showing the alignment ofthe ports therein when the valve is in the intake position;

FIG. 9 is a plan view of the two valve plates showing the alignment ofthe ports therein when the valve is in the discharge position;

FIG. 10 is a section showing the dispenser for the chemical tablets; and

FIG. 11 is a diagram of the control circuit.

Referring to the drawings (FIGS. 1 and 2), the toilet unit 10 anddecontamination tank ll2, unlike our pending application, are designedto be installed at a distance from each other with connecting flexibleconductors so that the size of the toilet unit may be kept small thus tomake the most efficient use of limited living space afforded in a vesseland to enable placing the decontamination tank in an out of the way partof the vessel which is not useful for living purposes.

The toilet unit 10 (FIG. 1) comprises a housing 14 made up of top andbottom shells 14a, 14b of molded plastic telescopically interengaged toenable removing the top shell for the purpose of inspection or repair.The top shell 14a has at the top an opening 16, peripherally of whichthere is a downwardly projecting flange l8 and around the back side atthe top a raised arcuate back 62. The bottom shell l4!) has at the backside openings 20 and 22. A bowl 24 having top and bottom openingsprovided with a jacket 26 is mounted within the housing in registrationwith the opening 16 with its lower open end connected to a trap 28, thelatter being supported at the bottom of the housing and fastened theretoby suitable fastening means 30. The connection between the bowl, jacketand trap is provided for by a flange 32 at the upper end of the trap onwhich the lower part of the jacket rests and an adapter ring 34 mountedbetween the jacket of the bowl and provided with a flange 36 whichoverlies the edge of the jacket resting on the flange 32. A rabettedgroove 38 at the top of the adapter ring 34 receives a flange 48 at thelower open end of the bowl. The upper end of the trap is rabetted at 42and a flexible member 43 is mounted in the groove 42 across the openingextending from the bowl into the trap, the flexible member being divideddiametrically along two or more diameters to provide flexible fingerswhich will bend downwardly to let water and effluent in the bowl passthrough into the trap and return to their undeflected positionsfollowing passage of such material thus serving as a means for blockingunpleasant odors and also as an antisplash guard. The trap 28 as isconventional in toilet apparatus provides for holding a quantity ofwater 44 thus to block flow of gases from the decontamination tankbackwardly through the piping to the bowl and has an elevated,rearwardly extending portion 46 which is adapted to be connected to adischarge conductor 48 through which water and effluent are flushed fromthe bowl and transferred to the decontamination tank. The portion 46 hasa flange 50 on it by means of which it is attached to a T-shapedcoupling member 52. The coupling member 52 has a part 52a which extendsthrough the opening 20 and is connected to the discharge conductor 48and a part 52b which is connected to a tablet dispensing device 54 (FIG.by means of which the tablets are introduced into the effluent and flushwater as the latter pass from the trap to the decontamination tank. Thedispenser which is the subject matter of our pending application Ser.No. 299,177, filed Oct. 19, 1972 is designed to dispense two tablets ofpredetermined chemical composition into a shuttle valve which in turn isrotated by a solenoid when the flush button is actuated to deliver thetwo tablets into the stream of water and effluent passing through thecoupling member 52. There are two sensing switches in the device whichare operable, in the absence of one or more tablets ready to bedispensed from the table container into the rotary valve, to disable thecontrol circuit.

A conductor pipe 55 provides for supplying clean water to the bowl toeffect flushing and is connected thereto through the opening 22 to oneend of a flexible conductor 56, the other end of which enters the bowlnear the top, as shown in FIG. I.

A seat ring 58 and cover 68 of conventional kind are mounted at the topof the housing above the opening 16. The control button F for effectingflushing and purging together with indicators, which will be describedhereinafter, are mounted on the back 62 in a convenient position.

The decontamination tank 12 (FIGS. 2, 3, 4 and 5) because it is notintended to be a storage tank is of lesser volumetric capacity than thatdisclosed in the aforesaid pending application and comprises asubstantially rectangular receptacle 64 which may be mounted in anysuitable out of the way space in the vessel. One side of the receptacle64 is open and around the opening there is a flange 66. A combinationpump, macerator and two-position valve 68 is mounted to the open side ofthe decontamination tank by means of the cover plate 70 which isfastened over the open side with a gasket 72 between it and the flange66. There is also mounted on the cover plate 78 an agitator 74 (FIGS.

2 and 3) which will be described hereinafter. The pump, macerator andvalve are thus readily accessible without dismantling the toilet unitand may be removed as a unit from the tank to provide access to the tankfor cleaning.

The combination pump, macerator and valve 68 provide for drawing cleanwater into the bowl to effect flushing, removing mixed water andeffluent from the trap, macerating the effluent, delivering the mixtureof water and macerated effluent to the decontamination tank for a periodof time sufficient to effect decontamination and discharging theinnocuous mixture of water and effluent overboard and also at times fordrawing clean water into the system to effect purging.

The combination pump, macerator and valve, as shown in FIGS. 6 and 7, isprovided with a coupling element 76 to which clean water is suppliedthrough an intake conductor 76a, coupling elements 78 and 78a connectedto the decontamination tank, a coupling element 80 to which theconductor element 48 from the trap is connected, a coupling element 83connected to the conductors 54 and 56 which supply clean water to thebowl and a coupling element 121 connected to an overboard dischargeconductor 121a. The pump comprises intake and discharge chambers 84 and86 within which are intake and discharge pump elements 88 and 90 mountedon a shaft 92 which extends into the chambers from a motor M supportedin a housing 94. The macerator comprises a chamber 96 through which theshaft 92 extends from the motor to the pump chambers within which thereis mounted on the shaft a macerator blade 98.

The valve comprises ported sections 101, 103 between which there arevalve plates comprising a fixed valve plate 102 and a movable valveplate 104 mounted to the pump macerator unit adapted to supply cleanwater to the pump for flushing effluent from the bowl to thedecontamination tank and discharging the decontaminated effluentoverboard and to provide also for flushing the system to clear it ofaccumulated debris. In contrast to the rotary type valve shown in thepending application the valve employed herein comprises flat platessupported for movement in face-toface engagement with each other bymeans of a plunger-type solenoid S connected to the movable plate so asto reduce to a minimum any tendency for the parts to become stuckedtogether especially from non-use over a long period of time.

The valve plates 102 and 104 are shown in plan view in FIGS. 8 and 9. InFIG. 8 the movable valve plate 104 is shown in the position to which itis moved by activating the solenoid S to initiate intake and illustratesthe alignment of the ports in this position, to wit, the alignment ofports C and G, D and H and F and I. FIG. 9 shows the retraction of themovable plate 104 relative to the fixed plate 102 when the timerde-energizes the solenoid S1 and in this position the ports A and G, Band H and E and I are in registration.

Referring to FIGS. 6 and 7, when the flush button F (FIG. 1) isdepressed the motor M is started and the intake pump element 88 drawswater from overboard through the intake conductor 76a into the couplingelement 76 through ports in the valve plates and a passage 108 into thepump chamber 84 and from thence through ports in the valve plates to apassage 110 (FIG. 7) connected to the coupling element 83 which in turnis connected to the conductors 5S and 56 leading to the bowl. The intakecoupling element '76 contains as shown in FIG. 6 a spring seated valveelement 76b which blocks reverse flow of the fluid in the system. Theclean water delivered to the bowl together with the effluent istransmitted by the discharge conductor 48 through the coupling elementbill to the macerator chamber 96. From the macerator chamber themacerated effluent passes to the pump chamber do by way of ports in thevalve plates and passage 114i and is discharged from the pump chamberthrough passage 119 at the discharge side of the pump element 90 andports in the valve plate and through the coupling 78 to thedecontamination tank. At the end of the decontamination cycle which issuitably timed the decontaminated effluent is withdrawn from thedecontamination tank by way of the coupling element 73a, ports in thevalve plates into the chamber 86 and discharged therefrom throughpassage 11%, ports in the plates, passage 121) and discharge coupling121 through the overboard conductor 121a. Simultaneously, clean water isdrawn in through the coupling element '76 through the ports in the valveplates into the pump chamber 88 and a part of this clean water isdelivered by the pump through a bypass passage 122 directly to thedischarge passage 121 and another part is discharged through thepassages 110 and 123 to the spray head 124- located in the tank. A pipe78b is connected at one end to the coupling 7&1 and is provided at itsother end with a wide mouth nozzle 780 which is supported at the bottomof the tank for emptying the tank during discharge.

As was just mentioned there is a spray 124 in the decontamination tankfor supplying clean water to the tank to clean the latter. The aforesaidagitator 74 re ferred to above is for the purpose of keeping theeffluent thoroughly mixed with the water and decontaminant and comprisesan electric motor M fastened by means of a bracket 126 to the coverplate 70. The bracket embodies a shaft housing 128 which extends throughthe plate into the bottom of the tank and a shaft 130 is journaled inthe shaft housing and connected at one end to the motor M and has at itsother end a blade 132 which operates to thoroughly mix and agitate theeffluent within the tank.

The pump motor, agitator motor and solenoid which effect operation ofthe valve are all connected in a control circuit shown in FIG. 11, thelatter being provided with interlocks to prevent initiating the flushingcycle if the decontamination tank is full or the tablet dispenser is notready to supply tablets at the moment of flushing and a timer forcontrolling the length of the decontamination. Referring specifically toFIG. 11 the circuitry is connected by lines L, L and L to the posi tiveand negative sides of a source of current which may comprise 12 or 32volt direct current or 110 volt alternating and/or direct current. Theflushed cycle is initiated by depressing the button F which, as referredto above, is mounted on the back of the bowl housing and will-beeffective if the switch HI is closed and the switches LO-LO are closed.The switch l-ll remains closed as long as the tank is not filled tocapacity and the switches LO-LO remain closed so long as there aredecontamination tablets in the dispenser ready to be dispensed. Signallights R and R are closed by means of switch elements 111-1 and LO-1when either of the switch elements HI and LO-LO are open to indicate,respectively, the fact that the tank is filled and/or that the dispensereither does not have tablets for dispensing or is malfunctioning.Assuming that conditions are proper for flushing the timer motor TM willbe started and this motor drives a cam shaft TS along which there aredisposed contacts lTRl, 1TR2, llTR3, 1TR1 and 1TR5. The contacts 1TR1and 1TR2 are normally closed and the remaining contacts are normallyopen. Since the contacts 1TR1 and 1TR2 are normally closed the timermotor will start to turn the cam shaft TS and will turn it through acomplete revolution so as to cycle the toilet provided the flush buttonis not again depressed before the end of the normal flush cycle. If itis depressed a second time before the first cycle is completed the firstswitch 1TR1 will restore the timer to its initial position and thesecond switch 1TR2 will then recycle the toilet. A light R3 willindicate that the timing motor is recycling the system.

Assuming that the flushing cycle has been started the cam shaft closesthe switch 1TR3 and this energizes a coil which closes contact C1 whichin turn starts the agitator motor M2. The cam shaft also closes theswitch 1TR4 which energizes the coil and closes contact C2 which in turnenergizes the solenoid S1 for operating the valve and solenoid S2 of therotary valve in the dispenser. Finally the switch 1TR5 is closed toenergize the coil and close contact C3 which energizes the motor M. Atthe end of the cycle of operation the switches are opened, stopping themotors M and M2 and de-energizing the solenoid S1, S2.

Switch H1 is connected to a float valve such as shown in our pendingapplication by means of which it is actuated when the level of the fluidin the tank rises to too high a level and switches LO-LO are operatedwhen one or more tablets fails to be discharged into the dischargepassage leading from the trap to the decontamination tank as shown inour pending application Ser. No. 299,177.

It should be understood that the present disclosure is for the purposeof illustration only and that this invention includes all modificationsand equivalents falling within the scope of the appended claims.

We claim:

1. In a marine toilet, a bowl open at the top and bottom, a trapconnected to the bottom opening, a decontamination tank, a combinationpump, maserator and valve, a conductor interconnecting the trap andtank, intake and discharge conductors connected respectively to theintake and discharge sides of the pump so that clean water entering theintake conductor passes through the valve and is delivered. to the bowlby the intake side of the pump and the mixture of clean water andeffluent is withdrawn from the trap into the maser' ator and deliveredinto the decontamination tank by the discharge side of the pump, saidvalve comprising flat plates containing parts aligned by shifting of oneof the valve plates relative to the other to provide for the aforesaidintroduction of clean water into the bowl and delivery of the mixture ofclean water and effluent to the decontamination tank, said plates beingarranged to have sliding engagement with each other and so that theedges of the ports have shearing engagement with each other and asolenoid operated plunger connected to the moveable one of the plates,said solenoid when energized being operable to slide the moveable one ofthe valve plates on the fixed one of the valve plates in a direction toinitiate a flushing cycle and a flush button electrically connected tothe solenoid operable to energize the solenoid.

2. Apparatus according to claim 1, wherein there is a control circuit inwhich the flush button is electrically connected for initiating theflush cycle, and a switch adapted to be actuated when thedecontamination tank fills to a predetermined level to disable the flushbutton.

3. Apparatus according to claim 2, comprising a timer in the controlcircuit operable to de-energize the solenoid at the end of apredetermined length of time whereupon the movable valve plate is movedrelative to the fixed valve plate to a position such that clean water issupplied to the decontamination tank and to the discharge conductor andsimultaneously a mixture of water and effluent is withdrawn from thedecontamination tank through the valve into the pump and dischargedtherefrom through the discharge conductor.

4. Apparatus according to claim 3, wherein there is an agitatorsupported in the decontamination tank for keeping the water and effluentmixed.

5. Apparatus according to claim 3, wherein there is a spray head mountedin the decontamination tank and a conductor connected to the pumpdelivers clean water to the spray head during the discharge part of theflush cycle.

6. Apparatus according to claim 3, wherein a tablet dispenser isinterposed between the discharge side of the trap and the macerator inthe line conducting the mixture of clean water and effluent from thetrap to the macerator and from there through the pump to thedecontamination tank by means of which decontamination tablets aredropped into the stream of mixed water and effluent.

7. Apparatus according to claim 1, wherein there is a tablet dispenserinterposed between the trap and the decontamination tank for introducingdecontamination tablets into the water and effluent as it leaves thetrap on its way to the decontamination tank, a control circuit in whichthe flush button is electrically connected for initiating a flush cycle,and switch means adapted to be actuated when the dispenser is depletedto disable the flush button.

8. Apparatus according to claim 1, wherein there is a control circuitcontaining a flush button for initiating a flush cycle and a recyclingswitch operable to effect a second flushing cycle in the event that theflush button is depressed a second time before the first flush cycle hasbeen completed.

9. Apparatus according to claim l, wherein there is a spring seatedvalve element in communication with the intake conductor which blocksreverse flow of fluid in the system.

10. Apparatus according to claim 1, wherein there is a flexible memberinterposed between the bowl and trap embodying displaceable fingerswhich, when undeflected, extend across the opening between the bowl andtrap, forming a seal and antisplash guard.

11. Apparatus according to claim 1, wherein the combination pump,macerator and valve are mounted as a unit exteriorly of thedecontamination tank so as to be accessible without dismantling thetoilet unit from the decontamination tank.

12. Apparatus according to claim 1, wherein a cover plate mounts thecombination pump, macerator and valve to the tank so as to enableremoving the pump, macerator and valve from the tank to provide accessto the tank.

1. In a marine toilet, a bowl open at the top and bottom, a trapconnected to the bottom opening, a decontamination tank, a combinationpump, maserator and valve, a conductor interconnecting the trap andtank, intake and discharge conductors connected respectively to theintake and discharge sides of the pump so that clean water entering theintake conductor passes through the valve and is delivered to the bowlby the intake side of the pump and the mixture of clean water andeffluent is withdrawn from the trap into the maserator and deliveredinto the decontamination tank by the discharge side of the pump, saidvalve comprising flat plates containing parts aligned by shifting of oneof the valve plates relative to the other to provide for the aforesaidintroduction of clean water into the bowl and delivery of the mixture ofclean water and effluent to the decontamination tank, said plates beingarranged to have sliding engagement with each other and so that theedges of the ports have shearing engagement with each other and asolenoid operated plunger connected to the moveable one of the plates,said solenoid when energized being operable to slide the moveable one ofthe valve plates on the fixed one of the valve plates in a direction toinitiate a flushing cycle and a flush button electrically connected tothe solenoid operable to energize the solenoid.
 2. Apparatus accordingto claim 1, wherein there is a control circuit in which the flush buttonis electrically connected for initiating the flush cycle, and a switchadapted to be actuated when the decontamination tank fills to apredetermined level to disable the flush button.
 3. Apparatus accordingto claim 2, comprising a timer in the control circuit operable tode-energize the solenoid at the end of a predetermined length of timewhereupon the movable valve plate is moved relative to the fixed valveplate to a position such that clean water is supplied to thedecontamination tank and to the discharge conductor and simultaneously amixture of water and effluent is withdrawn from the decontamination tankthrough the valve into the pump and discharged therefrom through thedischarge conductor.
 4. Apparatus according to claim 3, wherein there isan agitator supported in the decontamination tank for keeping the waterand effluent mixed.
 5. Apparatus according to claim 3, wherein there isa spray head mounted in the decontamination tank and a conductorconnected to the pump delivers clean water to the spray head during thedischarge part of the flush cycle.
 6. Apparatus according to claim 3,wherein a tablet dispenser is interposed between the discharge side ofthe trap and the macerator in the line conducting the mixture of cleanwater and effluent from the trap to the macerator and from there throughthe pump to the decontamination tank by means of which decontaminationtablets are dropped into the stream of mixed water and effluent. 7.Apparatus accordiNg to claim 1, wherein there is a tablet dispenserinterposed between the trap and the decontamination tank for introducingdecontamination tablets into the water and effluent as it leaves thetrap on its way to the decontamination tank, a control circuit in whichthe flush button is electrically connected for initiating a flush cycle,and switch means adapted to be actuated when the dispenser is depletedto disable the flush button.
 8. Apparatus according to claim 1, whereinthere is a control circuit containing a flush button for initiating aflush cycle and a recycling switch operable to effect a second flushingcycle in the event that the flush button is depressed a second timebefore the first flush cycle has been completed.
 9. Apparatus accordingto claim 1, wherein there is a spring seated valve element incommunication with the intake conductor which blocks reverse flow offluid in the system.
 10. Apparatus according to claim 1, wherein thereis a flexible member interposed between the bowl and trap embodyingdisplaceable fingers which, when undeflected, extend across the openingbetween the bowl and trap, forming a seal and antisplash guard. 11.Apparatus according to claim 1, wherein the combination pump, maceratorand valve are mounted as a unit exteriorly of the decontamination tankso as to be accessible without dismantling the toilet unit from thedecontamination tank.
 12. Apparatus according to claim 1, wherein acover plate mounts the combination pump, macerator and valve to the tankso as to enable removing the pump, macerator and valve from the tank toprovide access to the tank.